package com.sgdata.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

/**
 * 验证码类，主要生成英文字符加数字的验证码 
 * 这个类，没使用
 */
public class VerificationCodeUtil {
	private ByteArrayInputStream image;// 图像
	private String str;// 验证码
	private static final int WIDTH = 80;
	private static final int HEIGHT = 20;

	public static void main(String[] arg) {
		VerificationCodeUtil vcu = VerificationCodeUtil.Instance();
		System.err.println(vcu.getVerificationCodeValue());
	}

	/**
	 * 功能：获取一个验证码类的实例
	 * 
	 * @return
	 */
	public static VerificationCodeUtil Instance() {
		return new VerificationCodeUtil();
	}

	private VerificationCodeUtil() {
		BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
				BufferedImage.TYPE_INT_RGB);
		int randomNum = new Random().nextInt(3);
		if (randomNum == 0) {
			//initNumVerificationCode(image);
		} else if (randomNum == 1) {
			initLetterAndNumVerificationCode(image);
		} else {
			initChinesePlusNumVerificationCode(image);
		}
	}

	/**
	 * 功能：设置第二种验证码属性
	 */
	public void initLetterAndNumVerificationCode(BufferedImage image) {

		Random random = new Random(); // 生成随机类
		Graphics g = initImage(image, random);
		String[] letter = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
				"K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
				"W", "X", "Y", "Z" };
		String sRand = "";
		for (int i = 0; i < 4; i++) {
			String tempRand = "";
			if (random.nextBoolean()) {
				tempRand = String.valueOf(random.nextInt(10));
			} else {
				tempRand = letter[random.nextInt(25)];
				if (random.nextBoolean()) {// 随机将该字母变成小写
					tempRand = tempRand.toLowerCase();
				}
			}
			sRand += tempRand;
			g.setColor(new Color(20 + random.nextInt(10), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(tempRand, 13 * i + 6, 16);
		}
		this.setStr(sRand);/* 赋值验证码 */
		g.dispose(); // 图象生效
		this.setImage(drawImage(image));
	}

	/**
	 * 功能：设置第三种验证码属性 即：肆+？=24
	 */
	public void initChinesePlusNumVerificationCode(BufferedImage image) {
		String[] cn = { "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖", "拾" };
		Random random = new Random(); // 生成随机类
		Graphics g = initImage(image, random);
		int x = random.nextInt(10) + 1;
		int y = random.nextInt(30);
		this.setStr(String.valueOf(y));
		g.setFont(new Font("楷体", Font.PLAIN, 14));// 设定字体
		g.setColor(new Color(20 + random.nextInt(10), 20 + random.nextInt(110),
				20 + random.nextInt(110)));
		g.drawString(cn[x - 1], 1 * 1 + 6, 16);
		g.drawString("+", 22, 16);
		g.drawString("？", 35, 16);
		g.drawString("=", 48, 16);
		g.drawString(String.valueOf(x + y), 61, 16);
		g.dispose(); // 图象生效
		this.setImage(drawImage(image));

	}

	public Graphics initImage(BufferedImage image, Random random) {
		Graphics g = image.getGraphics(); // 获取图形上下文
		g.setColor(getRandColor(200, 250));// 设定背景色
		g.fillRect(0, 0, WIDTH, HEIGHT);
		g.setFont(new Font("Times New Roman", Font.PLAIN, 14));// 设定字体
		g.setColor(getRandColor(160, 200)); // 随机产生165条干扰线，使图象中的认证码不易被其它程序探测到
		for (int i = 0; i < 165; i++) {
			int x = random.nextInt(WIDTH);
			int y = random.nextInt(HEIGHT);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}
		return g;
	}

	public ByteArrayInputStream drawImage(BufferedImage image) {
		ByteArrayInputStream input = null;
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		try {
			ImageOutputStream imageOut = ImageIO
					.createImageOutputStream(output);
			ImageIO.write(image, "JPEG", imageOut);
			imageOut.close();
			input = new ByteArrayInputStream(output.toByteArray());
		} catch (Exception e) {
			System.out.println("验证码图片产生出现错误：" + e.toString());
		}
		return input;
	}

	/*
	 * 功能：给定范围获得随机颜色
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	/**
	 * 功能：获取验证码的字符串值
	 * 
	 * @return
	 */
	public String getVerificationCodeValue() {
		return this.getStr();
	}

	/**
	 * 功能：取得验证码图片
	 * 
	 * @return
	 */
	public ByteArrayInputStream getImage() {
		return this.image;
	}

	public String getStr() {
		return str;
	}

	public void setStr(String str) {
		this.str = str;
	}

	public void setImage(ByteArrayInputStream image) {
		this.image = image;
	}
}

